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The mass density of a parcel of air expressed in units of mass per volume.

Category:Meteorology

film hygrometer element-An electrical hygrometer element constructed of a plastic strip coated with a film of carbon black dispersed in a hygroscopic binder. Variations in atmospheric moisture content vary the volume of the binder and thus change the resi ...

Category:Meteorology

The process whereby a position on the scale of an instrument is identified with the magnitude of the signal (or input force) actuating the instrument.

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Closed, curved, flexible tube of elliptic cross section which is deformed, according to type, by variations of atmosphere spheric pressure or temperature and so provides a measurement of the particular parameter.

Category:Meteorology

A thermometer. the sensitive element of which consists of two metal strips which have different coefficients of expansion and are brazed together. The distortions of the system in response to temperature variations are used as a measure of temperature. It ...

Category:Meteorology

An inert gas. An element found in the atmosphere to the extent of only 0.000114 percent by volume. Its molecular weight is 83.7.

Category:Meteorology

See Koschmieder's law.

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An up slope wind due to local surface heating. Opposite of katabatic wind.

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The difference between amounts of precipitation and runoff for a given storm. It is that portion of the precipitation that remains in the basin as soil moisture, surface storage, ground water, etc.

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A type of disk hardness-gauge, especially useful in relatively soft snow. See disk hardness gauge.

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A system of estimating and reporting wind speed, originally based on the effect of various wind speeds on the amount of canvas that a full-rigged nineteenth century frigate could carry.

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The frequency of a carrier wave.

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Apparatus using the combined simultaneous action of a bimetallic thermometer and a hair hygrometer to move a needle in front of a divided scale. fts construction permits dew point variations to be indicated approximately.

Category:Meteorology

A psychrometer in which the ventilation is provided by a suction fan.

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The pressure unit of the meter-ton-second system of physical units. equal to 10 millibars or 101 dynes per cm2.

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A captive balloon used to maintain meteorological equipment aloft at approximately a constant height. The kytoon is streamlined and combines the aerodynamic properties of a balloon and a kite.

Category:Meteorology

The number of cycles per second between the limits of a frequency band.

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An instrument that automatically records pressure and temperature.

Category:Meteorology

A measure of the relative power, or of the relative values of two flux densities, especially of sound intensities and radar power densities. The decibel is derived from the less frequently used unit, the bel, named in honor of Alexander Graham Bell.

Category:Meteorology

Automated Local Evaluation in Real Time. Network of automatic rain gauges that transmit via VHF radio link when precipitation occurs. Some sites are also equipped with other sensors such as temperature, wind, pressure, river stage or tide level. More info ...

Category:Meteorology

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